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DCOM alone did little more than define a way to establish a communication channel between two pieces of COM-based software. To fill in the missing pieces required for building a feature-rich distributed computing solution, Microsoft eventually released Microsoft Transaction Server (MTS), which was later renamed to COM+. Despite its name, COM+ is not used only by COM programmers it is completely accessible to .NET professionals, as well. Since the first release of the .NET platform, the base class libraries provided a namespace named System.EnterpriseServices. Here, .NET programmers could build managed libraries that could be installed into the COM+ runtime to access the same set of services as a traditional COM+aware COM server. In either case, once a COM+-aware library was installed into the COM+ runtime, it was termed a serviced component. COM+ provides a number of features that serviced components can leverage, including transaction management, object lifetime management, pooling services, a role-based security system, a loosely coupled event model, and so on. This was a major benefit at the time, given that most distributed systems require the same set of services. Rather than forcing developers to code them by hand, COM+ provided an out-of-the-box solution. One of the compelling aspects of COM+ was the fact that all of these settings could be configured in a declarative manner using administrative tools. Thus, if you wished to ensure an object was monitored under a transactional context or belonged to a particular security role, you simply selected the correct check boxes. While COM+/Enterprise Services is still in use today, this technology is a Windows-only solution that is best suited for in-house application development or as a back-end service indirectly manipulated by more agonistic front ends (e.g., a public website that makes calls on serviced components [aka COM+ objects] in the background).

Notice that the GridView that displays the shopping cart information binds directly to the ShoppingCart collection Creating this GridView is fairly straightforward You can use BoundField tags in the same way that you would with a table, except now the DataField identifies the name of one of the properties in the ShoppingCartItem class Here are the bound columns used in the GridView for the shopping cart details: <asp:BoundField DataField="ProductID" HeaderText="ID"></asp:BoundField> <asp:BoundField DataField="ProductName" HeaderText="Product Name"> </asp:BoundField> <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" DataFormatString="{0:C}"></asp:BoundField> <asp:BoundField DataField="Total" HeaderText="Total" DataFormatString="{0:C}"></asp:BoundField> The column for displaying the Units property is slightly different It uses a TemplateField The template uses a text box, which displays the number of desired units, and allows the user to edit this number <asp:TemplateField HeaderText="Units"> <HeaderStyle Width="5px"></HeaderStyle> <ItemTemplate> <asp:TextBox runat="server" Font-Size="XX-Small" Width="31px" Text='<%# DataBinderEval(Container, "DataItem.

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@Entity @Table(name = "orders") public class Order { @Id @GeneratedValue(strategy = IDENTITY) @Column(name="order_id") private Integer id; @Column(name="order_date") private Date orderDate; @Column(name="ship_date") private Date shipDate; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public Date getOrderDate() { return orderDate; }

Note WCF does not provide a way to build serviced components. However, it does provide a manner for WCF services to communicate with existing COM+ objects. If you need to build serviced components using C#, you will need to make direct use of the System.EnterpriseServices namespace. Consult the .NET Framework 4.0 SDK documentation for details.

Units") %>'> </asp:TextBox> </ItemTemplate> </asp:TemplateField> If a user does decide to change the number of units for an item, the change must be committed by clicking an Update link in another column: <asp:CommandField ShowSelectButton="True" SelectText="Update" /> For simplicity, this link is also treated as a select command However, with slightly more code you could use the RowCommand event instead (as discussed in 10) When the user clicks the Update link, the GridViewRowCommand event fires At this point, the code finds the corresponding ShoppingCartItem instance and updates the Units property (or removes the item entirely if the count has reached 0) Here s the code that performs this task: Protected Sub gridCart_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) ' The first control in a template column is always a blank LiteralControl ' The text box is the second control Dim txt As TextBox = CType(gridCartRows(gridCartSelectedIndex)Cells(3).

The Microsoft Message Queuing (MSMQ) API allows developers to build distributed systems that need to ensure reliable delivery of message data on the network. As developers know all too well, in any distributed system there is the risk that a network server is down, a database is offline, or connections are inexplicably lost. Furthermore, you must construct many applications in such a way that they hold message data for delivery at a later time (this process is known as queuing data). Microsoft initially packaged MSMQ as a set of low-level C-based APIs and COM objects. With the release of the .NET platform, C# programmers could use System.Messaging namespace to hook into

Controls(1), TextBox) Try ' Update the appropriate cart item Dim newCount As Integer = IntegerParse(txtText) If newCount > 0 Then ProfileCart(gridCartSelectedIndex)Units = newCount ElseIf newCount = 0 Then ProfileCartRemoveAt(gridCartSelectedIndex) End If Catch ' Ignore invalid (nonnumeric) entries End Try gridCartSelectedIndex = -1 End Sub.

MSMQ and build software that communicated with intermittently connected applications in a dependable fashion. On a related note, the COM+ layer incorporated MSMQ functionality into the runtime (in a simplified format) using a technology termed Queued Components (QC). This manner of communicating with MSMQ was packaged up into the System.EnterpriseServices namespace mentioned in the previous section. Regardless of which programming model you used to interact with the MSMQ runtime, the end result ensured that applications could deliver messages in a reliable and timely fashion. Like COM+, MSMQ is still part of the fabric of building distributed software on the Windows operating system.

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